Sunan an-Nasa'i 2354
سنن النسائي#2354SahihIt was narrated that 'Aishah said:"The Messenger of Allah did not fast any month more than Shaban; he used to fast (all of) it, or most of it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahHasan Sahih
Al-AlbaniHasan Sahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 22:265